粉末冶金技术2024，Vol.42Issue(6)：589-599,11.DOI:10.19591/j.cnki.cn11-1974/tf.2023010005
孔隙结构对3D打印多孔钨力学性能的影响
Influence of pore structure on mechanical properties of 3D printing porous tungsten
摘要
Abstract
The porous tungsten with the cube and triangular pyramid shape was designed by ANSYS finite element analysis in this paper.In the results,when the point,line,and plane loads are applied,respectively,the stress on the cube and triangular pyramid skeleton units is uneven.When the skeleton unit is subjected to the plane and line loads,respectively,the stress at the supported struts is relatively small,while the stress at the unsupported struts is relatively large,causing a large amount of deformation.When the skeleton unit is subjected to the point load,the stress and deformation are both the maximum at the loading point.The porous tungsten in the shape of cube and triangular pyramid with high porosity was fabricated by selective laser melting(SLM)technique,and the effects of pore shape and size on the mechanical properties were investigated.The results show that the macrostructure of these skeleton structure is not significantly different from the designed structure,but the porosity is lower than that of the designed value,because of the hanging and sticky powders on the skeleton struts.The tensile strength of cube skeleton with 50%and 80%porosity is 127.4 MPa and 55.8 MPa,the compressive strength is 667.1 MPa and 213.0 MPa,the impact toughness is 6.764 and 4.492 J·cm-2.The compressive strength of the triangular pyramid skeleton with 50%and 80%porosity is 231.1 MPa and 65.3 MPa,the impact toughness is 2.030 J·cm-2,and the hardness is similar as that of the cube skeleton.The tensile and compressive fracture morphology of the cube and triangular porous tungsten show the typical quasi-cleavage brittle fracture.关键词
多孔钨/孔隙结构/有限元/显微组织/力学性能Key words
porous tungsten/pore structure/finite element/microstructure/mechanical properties分类
矿业与冶金引用本文复制引用
王春锦,陈文革,孟祥瑞,张辉,周新文..孔隙结构对3D打印多孔钨力学性能的影响[J].粉末冶金技术,2024,42(6):589-599,11.基金项目
西安市、咸阳市研发项目(23ZDCYJSGG0042-2022,2021ZDYF-GY-0126) （23ZDCYJSGG0042-2022,2021ZDYF-GY-0126）
